Function atan() calculates the radian of a tangent value.

Arguments：

• Tangent <number>

Returns：

• Radian <number>, ∈ [-PI/2, PI/2]

Common Usage

Example: Calculate the radian of tangent value 1

return atan(1) * 180 / pi()

45

Example: Calculate the radian of each row (tangent value) of an alias

uncollect [1, -0.5, 0] as a
return atan(a)

0.785398163397448
-0.463647609000806
0